| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [adj] [noun pl] | 36593 |
|
| 2 | difficult [to-vb] [adj] | 763 |
|
| 3 | difficult [to-vb] [noun pl] | 260 |
|
| 4 | difficult [adj] [noun pl] | 115 |
|
